//map,flatmap,filter,reduceの使い方
import UIKit

//MAPの使い方
let arr1 = ["a","b","c","d"]
let arr11 = arr1.map {$0 + "z"}
print(arr11)

//FlatMAPの使い方
let arrArr = [["a","b"],["c","d"]]
let arrArr2 = arrArr.flatMap { $0 }
print(arrArr2)

//MAPの使い方(dic版)
let dic = ["test1":1,"test2":2,"test3":3]
let dic2 = dic.map {($0.0 + "x",$0.1 + 1)}
print(dic2)

//filterの使い方
let arr3 = [1,2,3,4,5]
let arr31 = arr3.filter {$0 > 2}
print(arr31)

//reduceの使い方(一つにまとめる)
var arr4 = [1,2,3,4,5]
 let sum = arr4.reduce(1) {(num1,num2) -> Int in
  num1 * num2
}
print(sum)